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Lake Alamosa

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Journal Article
Published: 01 December 2017
Rocky Mountain Geology (2017) 52 (2): 107–117.
... the evolution of ancient Lake Alamosa, which filled much of the San Luis Valley in the Pliocene and Pleistocene. Thick intervals of massive clay, recovered at the well (BP-3-USGS [U.S. Geological Survey]), represent deposition as part of this extensive lacustrine environment. Oriented paleomagnetic samples from...
FIGURES | View All (4)
Series: GSA Special Papers
Published: 01 April 2013
DOI: 10.1130/2013.2494(01)
... From Pliocene to middle Pleistocene time, a large lake occupied most of the San Luis Valley above 2300 m elevation (7550 ft) in southern Colorado. This ancient lake accumulated sediments of the Alamosa Formation (Siebenthal, 1910), for which the lake is herein named. The existence of this lake...
Series: GSA Field Guide
Published: 07 September 2016
DOI: 10.1130/2016.0044(13)
EISBN: 9780813756448
... ; Cole et al., 2007 ; Konning et al., 2011 ) (Fig. 1 ). This guidebook describes a two-day field trip across the northern and southern San Luis Basins (Figs. 2 and 3 ). The first day examines and describes evidence supporting the presence and overflow history of Pleistocene Lake Alamosa...
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Image
Location of BP-3-USGS well near Great Sand Dunes National Park and Preserve...
Published: 01 December 2017
Figure 1. Location of BP-3-USGS well near Great Sand Dunes National Park and Preserve in Alamosa County of southern Colorado (modified from Grauch et al., 2015 ). Also shown are the: (1) inferred limit of the last highstand of Pliocene and Pleistocene Lake Alamosa before its disappearance (from
Image
(A) Location of the Rio Grande rift (shaded) and River; red box shows locat...
Published: 26 April 2019
Figure 1. (A) Location of the Rio Grande rift (shaded) and River; red box shows location of Figure 1B . (B) Generalized geology of the northern Rio Grande rift and the location of the pluvial Lake Alamosa (after Machette et al., 2013 ), Figure 1C (white box), and Figure 1D (from circled N
Journal Article
Journal: Geosphere
Published: 02 April 2021
Geosphere (2021) 17 (3): 898–931.
... to reflect a period of low magma flux that occurred substantially after the ignimbrite eruption ( Mills and Coleman, 2013 ). Elsewhere in the SRMVF, the ca. 23 Ma Lake City caldera contains postcaldera syenite intrusions that represent mushy magma that did not erupt, while monzonite intrusions represent...
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Journal Article
Journal: AAPG Bulletin
Published: 01 February 1957
AAPG Bulletin (1957) 41 (2): 181–196.
... of Alamosa Creek Valley, Socorro County, New Mexico with Special Reference to the Occurrence of Oil and Gas ,” ibid., Bull . 716-A.1 Young , R. G. , 1956a , “ Surface Geologic Map of Ambrosia Lake Area, McKinley County, New Mexico ,” U. S. Atomic Energy Comm. Map No. 7 , prelim. ed. Young...
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Image
Photomicrographs (cross-polarized light) of Platoro intrusions and the Chiq...
Published: 02 April 2021
) Equigranular Alamosa River monzonite with granophyric texture; right panel is shown in cathodoluminescence (SRM22). (C) Alum Creek monzonite porphyry (DC1). (D) Jasper monzonite (SRM25). (E) Cornwall Mountain quartz monzonite porphyry (SRM23). (F) Lake Annella andesite porphyry (17AG06). (G) Bear Creek
Image
—Sections of Gallup sandstone and associated beds of Upper Cretaceous age f...
Published: 01 February 1957
FIG. 2. —Sections of Gallup sandstone and associated beds of Upper Cretaceous age from Alamosa Creek Valley area, Socorro and Catron counties, north to Ambrosia Lake area, McKinley County, New Mexico.
Journal Article
Journal: Geosphere
Published: 26 April 2019
Geosphere (2019) 15 (3): 820–838.
...Figure 1. (A) Location of the Rio Grande rift (shaded) and River; red box shows location of Figure 1B . (B) Generalized geology of the northern Rio Grande rift and the location of the pluvial Lake Alamosa (after Machette et al., 2013 ), Figure 1C (white box), and Figure 1D (from circled N...
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Journal Article
Journal: The Leading Edge
Published: 01 August 2013
The Leading Edge (2013) 32 (8): 882–891.
..., Rio Grande rift, New Mexico : Geological Society of America Bulletin , 120 , no. 5/6 , 641 – 658 , 10.1130/B26213.1 . Machette M. N. , Thompson R. A. , Marchetti D. W. , and Smith R. S. U. , 2013 , Evolution of ancient Lake Alamosa and integration of the Rio Grande...
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Journal Article
Journal: Geosphere
Published: 30 September 2019
Geosphere (2019) 15 (6): 1893–1926.
... ; Gibson et al., 1993 ; Gonzales, 2015 ; Gonzales and Lake, 2017 ). This paper presents new petrologic data (compositions for 105 widely distributed samples) and 58 new 40 Ar/ 39 Ar ages for the overall areal extent of the Platoro-Dulce dike swarm in relation to concurrent regional magmato-tectonic...
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Image
Geologic map showing location of measured sections of Gallup sandstone and ...
Published: 01 February 1957
FIG 1 Geologic map showing location of measured sections of Gallup sandstone and associated beds from the Alamosa Creek Valley area, Socorro and Catron Counties north to the Ambrosia Lake area, McKinley County, New Mexico. Generalized from Preliminary geologic map of northwestern part of New
Journal Article
Journal: AAPG Bulletin
Published: 01 November 1965
AAPG Bulletin (1965) 49 (11): 2041–2075.
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Journal Article
Journal: SEG Discovery
Published: 01 July 1994
SEG Discovery (1994) (18): 1–32.
... are confirmed by the that some may go into production offers new research opportunities new study. Three economically attractive pipes have been identified to academia and government geologists, new exploration and to date: Panda Lake (118 carats/100 tonnes), Fox Lake, and Koala exploitation challenges...
Journal Article
Journal: Geosphere
Published: 01 June 2017
Geosphere (2017) 13 (3): 974–990.
... the San Juan Mountains ( Brister, 1990 ; Brister and Gries, 1994 ). None crop out in the range front near the study area. Locally, the dominant shallow constituent of the Santa Fe Group is the Alamosa Formation ( Siebenthal, 1910 ), composed mainly of thin beds of gravel, sand, silt, and clay...
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(A) Reconstructed topography of the original 10 Ma surface produced by remo...
Published: 01 August 2013
features are: Kaibab uplift (KU); Monument uplift (MU); proto–Lake Bonneville (LB); Alamosa Lake (A).
Image
Schematic west-east section through the Platoro caldera complex. (A) Early ...
Published: 02 April 2021
is uncertain, and thus its depiction is schematic. (B) Section through the Platoro caldera complex post–28 Ma. Intracaldera intrusions such as the Alamosa River monzonite (ARM) intrude the Chiquito Peak Tuff and Summitville Andesite. The Cornwall Mountain resurgent block is not depicted for simplicity
Journal Article
Journal: Geosphere
Published: 24 October 2018
Geosphere (2018) 14 (6): 2487–2504.
... proximal to playa dust sources, such as the former basin of Lake Alamosa immediately west of these fans ( Machette et al., 2013 ), then a steady or climate-modulated rate of dust input may drive dust deposition ( Pelletier, 2007 ). As a consequence, while we do not document this here, it is likely that our...
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Journal Article
Journal: Geosphere
Published: 06 October 2020
Geosphere (2020) 16 (6): 1457–1478.
... fan deposition. The Pliocene–Pleistocene Sierra Ladrones basin-fill deposits are vertically incised up to ∼130 m in the Socorro Basin and in adjacent rift basins. The transition from basin filling to valley incision was aided or possibly driven by a major lake overflow event at Lake Alamosa (ca. 440...
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